INFLUENCE OF ESTABLISHMENT METHODS AND INTEGRATED NITROGEN MANAGEMENT ON GROWTH, PRODUCTIVITY AND SOIL FERTILITY OF RICE (ORYZA SATIVA L.)

Abstract

A field experiment was conducted at GBPUA and T, Pantnagar, Uttarakhand, for two years (2010 to 2011)
during Kharif to study the effect of varying nitrogen sources and methods of rice establishment, yield attributes,
productivity, economics of rice (Oryza sativa) and soil fertility status. The treatment comprised of three rice
establishment methods viz., conventional transplanting(CT), system of rice intensification(SRI) and aerobic rice
(DSR) in main plots and four nutrient sources viz.,N25(FYM)+ N95(urea), N50(FYM)+ N70(urea), N75(FYM)+ N45(urea) and N120 (urea)
in sub-plots tested in split plot design with four replications. Significantly higher number of filled grains per m2,
panicle weight,, test weight and grain yield were achieved due to SRI compared to conventional transplanting and
aerobic rice cultivation. System of rice intensification recorded significantly higher grain yield (5.49 t/ha, averaged
over two years) being 11% higher than conventional transplanting. Lowest grain yield (4.63 t/ha, averaged over
two years) was recorded under aerobic rice being 7% lower than conventional transplanting. Among the nutrient
sources, N75 (FYM) + N45 (urea) significantly enhanced the number of panicles per m2, panicle length, panicle weight,
number of filled spikelets per panicle, filled spikelets per m2,1000-grain weight and yield of rice (5.17t/ha,
averaged over two years) compared to nitrogen through urea alone.